So I jump to avoid an enemy and land on... thin air. I don't know if this is common knowledge, but it's new to me. There are at least two (glitched) invisible platforms in this stage. You can see the location of one in the picture. (I was playing the actual Sega Genesis, not an emulator, hence the ugly camera shot.)

If you stand on one and press down + C, you begin to fall through but stop a few pixels down. Given their proximity to the bull/charging enemies in the stage, I assume that they are just the trigger objects that spawn or activate the bulls, which the developers accidentally made solid, or something like that.